Of the remaining Karaites of the tenth century, the foremost was Japhet, the son of Ali, whose commentaries on the Bible represent the highest achievements of Karaism.

A large Hebrew dictionary (_Iggaron_), by a contemporary of Japhet named David, the son of Abraham, is also a work which was often quoted.

Kirkisani, also a tenth century Karaite, completed in the year 937 a treatise called, "The Book of Lights and the High Beacons." In this work much valuable information is supplied as to the history of Karaism.

Despite his natural prejudices in favor of his own sect, Kirkisani is a faithful historian, as frank regarding the internal dissensions of the Karaites as in depicting the divergence of views among the Rabbinites.

Kirkisani's work is thus of the greatest importance for the history of Jewish sects.
Finally, the famous Karaite Judah Hadassi (1075-1160) was a young man when his native Jerusalem was stormed by the Crusaders in 1099.